US20100258528A1 - Chemical mechanical polishing of silicon carbide comprising surfaces - Google Patents
Chemical mechanical polishing of silicon carbide comprising surfaces Download PDFInfo
- Publication number
- US20100258528A1 US20100258528A1 US12/422,771 US42277109A US2010258528A1 US 20100258528 A1 US20100258528 A1 US 20100258528A1 US 42277109 A US42277109 A US 42277109A US 2010258528 A1 US2010258528 A1 US 2010258528A1
- Authority
- US
- United States
- Prior art keywords
- particles
- hardness
- coating
- silicon carbide
- slurry
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 74
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000005498 polishing Methods 0.000 title claims abstract description 47
- 239000000126 substance Substances 0.000 title description 16
- 239000002245 particle Substances 0.000 claims abstract description 134
- 239000002002 slurry Substances 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 41
- 239000007800 oxidant agent Substances 0.000 claims abstract description 26
- 239000000203 mixture Substances 0.000 claims abstract description 23
- 150000003623 transition metal compounds Chemical class 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 238000000576 coating method Methods 0.000 claims description 49
- 239000011248 coating agent Substances 0.000 claims description 42
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims description 42
- 150000001875 compounds Chemical class 0.000 claims description 30
- 239000012286 potassium permanganate Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000011246 composite particle Substances 0.000 claims description 11
- 229910001428 transition metal ion Inorganic materials 0.000 claims description 7
- 229910021645 metal ion Inorganic materials 0.000 claims 1
- 229910052723 transition metal Inorganic materials 0.000 abstract description 19
- 150000003624 transition metals Chemical class 0.000 abstract description 18
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 83
- 239000000377 silicon dioxide Substances 0.000 description 35
- 239000000463 material Substances 0.000 description 26
- 239000007771 core particle Substances 0.000 description 20
- 239000011572 manganese Substances 0.000 description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 15
- 239000004094 surface-active agent Substances 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 13
- 239000010432 diamond Substances 0.000 description 13
- 238000007306 functionalization reaction Methods 0.000 description 13
- 229910052710 silicon Inorganic materials 0.000 description 13
- 239000010703 silicon Substances 0.000 description 13
- 239000000243 solution Substances 0.000 description 13
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 12
- 229910003460 diamond Inorganic materials 0.000 description 12
- 235000012431 wafers Nutrition 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 10
- 238000004630 atomic force microscopy Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- 229910052582 BN Inorganic materials 0.000 description 6
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 6
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 230000003197 catalytic effect Effects 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- MMIPFLVOWGHZQD-UHFFFAOYSA-N manganese(3+) Chemical compound [Mn+3] MMIPFLVOWGHZQD-UHFFFAOYSA-N 0.000 description 6
- -1 permanganates Chemical class 0.000 description 6
- 229910052581 Si3N4 Inorganic materials 0.000 description 5
- 239000003082 abrasive agent Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical class [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 5
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000011701 zinc Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 4
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 4
- 229910000420 cerium oxide Inorganic materials 0.000 description 4
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 4
- 150000001805 chlorine compounds Chemical class 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 4
- 230000003746 surface roughness Effects 0.000 description 4
- 239000005751 Copper oxide Substances 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 229910000431 copper oxide Inorganic materials 0.000 description 3
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 3
- 229910000366 copper(II) sulfate Inorganic materials 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 229910021380 Manganese Chloride Inorganic materials 0.000 description 2
- GLFNIEUTAYBVOC-UHFFFAOYSA-L Manganese chloride Chemical compound Cl[Mn]Cl GLFNIEUTAYBVOC-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 2
- HKVFISRIUUGTIB-UHFFFAOYSA-O azanium;cerium;nitrate Chemical class [NH4+].[Ce].[O-][N+]([O-])=O HKVFISRIUUGTIB-UHFFFAOYSA-O 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 125000002091 cationic group Chemical group 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910000428 cobalt oxide Inorganic materials 0.000 description 2
- KTVIXTQDYHMGHF-UHFFFAOYSA-L cobalt(2+) sulfate Chemical compound [Co+2].[O-]S([O-])(=O)=O KTVIXTQDYHMGHF-UHFFFAOYSA-L 0.000 description 2
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- LBSANEJBGMCTBH-UHFFFAOYSA-N manganate Chemical compound [O-][Mn]([O-])(=O)=O LBSANEJBGMCTBH-UHFFFAOYSA-N 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011565 manganese chloride Substances 0.000 description 2
- 150000002697 manganese compounds Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical class OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 150000002978 peroxides Chemical class 0.000 description 2
- 238000007517 polishing process Methods 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 2
- 238000007704 wet chemistry method Methods 0.000 description 2
- QLOKJRIVRGCVIM-UHFFFAOYSA-N 1-[(4-methylsulfanylphenyl)methyl]piperazine Chemical compound C1=CC(SC)=CC=C1CN1CCNCC1 QLOKJRIVRGCVIM-UHFFFAOYSA-N 0.000 description 1
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 229910052580 B4C Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 229910018540 Si C Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 150000004703 alkoxides Chemical class 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- UKFWSNCTAHXBQN-UHFFFAOYSA-N ammonium iodide Chemical compound [NH4+].[I-] UKFWSNCTAHXBQN-UHFFFAOYSA-N 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003139 biocide Substances 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- SXDBWCPKPHAZSM-UHFFFAOYSA-M bromate Chemical class [O-]Br(=O)=O SXDBWCPKPHAZSM-UHFFFAOYSA-M 0.000 description 1
- 239000008364 bulk solution Substances 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- ZMIGMASIKSOYAM-UHFFFAOYSA-N cerium Chemical compound [Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce][Ce] ZMIGMASIKSOYAM-UHFFFAOYSA-N 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000008119 colloidal silica Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- YAGKRVSRTSUGEY-UHFFFAOYSA-N ferricyanide Chemical compound [Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] YAGKRVSRTSUGEY-UHFFFAOYSA-N 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- ICIWUVCWSCSTAQ-UHFFFAOYSA-N iodic acid Chemical class OI(=O)=O ICIWUVCWSCSTAQ-UHFFFAOYSA-N 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007783 nanoporous material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- LLYCMZGLHLKPPU-UHFFFAOYSA-N perbromic acid Chemical class OBr(=O)(=O)=O LLYCMZGLHLKPPU-UHFFFAOYSA-N 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical class OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- JRKICGRDRMAZLK-UHFFFAOYSA-L persulfate group Chemical group S(=O)(=O)([O-])OOS(=O)(=O)[O-] JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005240 physical vapour deposition Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011164 primary particle Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000006557 surface reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/304—Mechanical treatment, e.g. grinding, polishing, cutting
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/31—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to form insulating layers thereon, e.g. for masking or by using photolithographic techniques; After treatment of these layers; Selection of materials for these layers
- H01L21/3105—After-treatment
- H01L21/31051—Planarisation of the insulating layers
- H01L21/31053—Planarisation of the insulating layers involving a dielectric removal step
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09G—POLISHING COMPOSITIONS; SKI WAXES
- C09G1/00—Polishing compositions
- C09G1/02—Polishing compositions containing abrasives or grinding agents
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1436—Composite particles, e.g. coated particles
- C09K3/1445—Composite particles, e.g. coated particles the coating consisting exclusively of metals
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/1454—Abrasive powders, suspensions and pastes for polishing
- C09K3/1463—Aqueous liquid suspensions
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
- H01L21/02005—Preparing bulk and homogeneous wafers
- H01L21/02008—Multistep processes
- H01L21/0201—Specific process step
- H01L21/02024—Mirror polishing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/0445—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising crystalline silicon carbide
- H01L21/0475—Changing the shape of the semiconductor body, e.g. forming recesses
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/30625—With simultaneous mechanical treatment, e.g. mechanico-chemical polishing
Definitions
- Embodiments of the present invention relate to chemical mechanical polishing (CMP) of silicon carbide comprising materials, such as for fabricating integrated circuits (ICs) including silicon carbide comprising materials.
- CMP chemical mechanical polishing
- Silicon carbide possesses unique electrical and physical properties that make it suitable for high power, high frequency and high temperature electronic devices including ICs. Such properties have fueled an intense research effort in the last several years that has prompted the need to develop larger sized, epi-ready and substantially defect/damage-free silicon carbide wafers.
- the preparation of silicon carbide wafers is known to require multiple polishing steps including a mechanical polishing step in which particles which are typically harder than silicon carbide (Mohs hardness of 9, Knoop hardness 2,400-3,000 Kg/mm 2 ), such as boron nitride (BN; Mohs hardness of 9.9, Knoop hardness 4,500-5,000 Kg/mm 2 ) or diamond (Mohs hardness of 10, Knoop hardness 8,000-12,000 Kg/mm 2 ) or Boron Carbide (Mohs hardness 9.35, Knoop hardness 2,900-3,580 Kg/mm 2 ) are used to achieve reasonable silicon carbide polishing rates.
- BN boron nitride
- Mohs hardness of 9.9 Knoop hardness 4,500-5,000 Kg/mm 2
- diamond Mohs hardness of 10
- Boron Carbide Mohs hardness 9.35, Knoop hardness 2,900
- the very hard particles required for the mechanical polishing step generally results in a high degree of damage to the silicon carbide surface including scratches and dislocations which generally develop both at the surface and sub-surface of the wafer.
- the mechanical polishing step is typically followed by a CMP step which uses particles that are still abrasive, but are less abrasive as compared to diamond or BN, such as aluminum oxide (Mohs hardness about 9, Knoop hardness 1,800-2,200 Kg/mm 2 ), titania (Mohs hardness of 5.5 to 6.5 Knoop Hardness 500-600 Kg/mm 2 ), or Garnet Mohs hardness about 8, Knoop hardness 1360 Kg/mm 2 , silica/quartz (Mohs hardness of 7, Knoop Hardness 900-1,200 Kg/mm 2 ), or zirconia (Mohs hardness about 8, Knoop hardness 1,120 Kg/mm 2 to polish the surface regions and attempt to reduce the surface and sub-surface damage induced
- the abrasives that are harder than silicon carbide provide reasonably high polishing rates, but cause significant surface and sub-surface damage.
- the abrasives which are softer than silicon carbide typically provide low polishing rates, and significantly less damage. Since the CMP particles used are still significantly abrasive, new damage is generated during the CMP process.
- silicon carbide and silicon carbide comprising materials are generally chemically inert materials, the CMP process typically is very slow, and thus requires a long cycle time, as the slurry chemicals do not react with the silicon carbide comprising surface. Therefore, there is a need to develop new CMP slurries and/or methods for polishing silicon carbide comprising materials which decrease damage and increase the polishing rate.
- Embodiments of the present invention describe slurry compositions and chemically activated CMP methods for polishing a substrate having a silicon carbide comprising surface using such slurries.
- the silicon carbide comprising surface is contacted with a CMP slurry composition that comprises i) a liquid (e.g. water) carrier, ii) and a plurality of particles having at least a soft surface portion, wherein the soft surface portion comprises a transition metal compound that provides a Mohs hardness ⁇ 6 or Knoop Hardness less than 900 Kg/mm 2 .
- an oxidizing agent can be added.
- the slurry is moved relatively near or close to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide comprising surface is removed.
- the soft surfaced particles can be what are referred to herein as “coated particles” in some embodiments of the invention or “soft functionalized particles” in other embodiments of the invention.
- Soft functionalized particles generally comprise a thin soft surface coating comprising a water insoluble compound of a transition metal on an abrasive surface.
- Soft functionalization is defined herein as the arrangement where the thickness of the transition metal comprising coating on the core particles is between 0.001 monolayers to 10 monolayers, and comprised of transition metal comprising materials that have a Knoop Hardness of 900 Kg/mm 2 when measured in their bulk form.
- the soft surface coating of the soft functionalized particles can be a discontinuous or continuous coating, and its thin nature results in its surface properties generally being different from the core but having a hardness that will generally be similar to the core.
- coated particles have a coating that is generally a continuous coating that is thicker and is typically much thicker (e.g. >10 monolayers to 100,000 monolayers (about 30 microns)) as compared to the coating for the soft functionalized particles, and its surface properties surface properties and hardness will generally be controlled by the coating and thus be different from the core.
- the soft surfaced particles in slurries according to embodiments of the invention have been found to unexpectedly provide high polishing rates considering the much harder and highly inert silicon carbide comprising surface, such as removal rates of ⁇ 200 nm/hr. Moreover, slurries according to embodiments of the invention have been found to significantly reduce surface and sub-surface damage present from earlier processing. Accordingly, embodiments of the invention provide new CMP slurries and related methods for polishing silicon carbide comprising materials which significantly increase the polishing rate and decrease damage to the silicon carbide comprising surface.
- FIG. 1 shows steps in an exemplary method of chemical mechanical polishing of a silicon carbide comprising surface, according to an embodiment of the invention.
- FIG. 1 shows steps in an exemplary method 100 of chemical mechanical polishing a substrate having a silicon carbide comprising surface, according to an embodiment of the invention.
- Step 101 comprises providing a chemical-mechanical polishing slurry composition.
- the slurry composition comprises i) a liquid (e.g. water) carrier, and ii) a plurality of particles having at least a soft surface portion, wherein the soft surface portion comprises a transition metal compound that provides a Mohs hardness ⁇ 6 or a Knoop Hardness less than 900 Kg/mm 2 .
- the slurry composition can further comprise iii) an oxidizing agent, wherein the oxidizing agent comprises a transition metal ion.
- Step 102 comprises contacting the silicon carbide comprising surface with the slurry composition.
- Step 103 comprises moving the slurry composition relatively near or close to relative to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide comprising surface is removed.
- the silicon carbide comprising surface can generally be of any orientation.
- silicon face, carbon face, mixed face, m-face, a-face generally any miscut from regular crystallographic faces, any polytype, mixed polytype, doped, undoped, polycrystalline, amorphous, cubic or hexagonal symmetry.
- silicon and carbon can mixed with other compounds, such as boron, aluminum, oxygen and nitrogen.
- the soft surfaced particles in slurries according to embodiments of the invention have been found to unexpectedly provide a high polishing rate for the much harder and highly inert silicon carbide comprising surface, such as a removal rate ⁇ 200 nm/hr, including removal rates >1,000 nm/hr (>1 ⁇ m/hr), along with a significant reduction in surface and sub-surface damage that is left over from prior polishing using a harder abrasive.
- the Present Inventors provide herein some mechanisms believed to be operable that can be used to explain the unexpectedly high removal rate provided by CMP processing with the use of particles having a soft surface according to embodiments of the invention.
- CMP processes may generally be based on catalytic breakdown of the oxidizing agent which provides reactive species that increase the removal rate.
- the catalytic action can be enhanced by one or more of higher temperature (e.g. 35 to 90° C.), rubbing action during the CMP process, presence of insoluble compounds and elements of transition metals, functionalization of the surface of a particle with insoluble elements or compounds of transition metals, presence of soluble transition metal ions, increase in friction during the polishing, formation of insoluble transition metal compound during polishing as a result of breakdown of the oxidizer, or coating of pad surface with a transition metal oxide or insoluble compound.
- higher temperature e.g. 35 to 90° C.
- oxidizers examples include peroxides, permanganates, perchlorates, and oxidizers containing transition metal elements such as permanganates, ferrocyanides, ferricyanides, chromates, cerium ammonium nitrates.
- transition metal elements such as permanganates, ferrocyanides, ferricyanides, chromates, cerium ammonium nitrates.
- oxidizers that breakdown into insoluble compounds of transition elements include permanganates and chromates.
- oxidizers than breakdown into insoluble products that generally coat the polishing pad include, permanganates, and chromates.
- the pad coating can be in form insoluble surface films as a result of byproducts from the slurry.
- byproducts refers to insoluble compounds formed from either the breakdown of the oxidizers or reactant products from the chemicals in the slurry and the silicon carbide comprising surface.
- the catalytic action can be accelerated by a local temperature increase that can occur during the polishing process itself.
- the temperature can be increased by providing an external heating source, such as heated slurries, heating of the pad and polishing apparatus using lamps, and resistively heating sources.
- the catalytic action can also be provided by ultraviolet (UV) breakdown using high photon energy sources such as UV lamps.
- UV ultraviolet
- the catalytic action can be accelerated also by the presence of soluble ions (e.g. transition metal ions of manganese, zinc, chromium, iron, cobalt, copper,) insoluble soft surface compositions (e.g.
- transition metal Mn, Cu, Zn, Co, Fe, Ni
- oxides nitrides, chlorides, sulfates, nitrates carbonates (e.g. MnO 2 , MnCl 3 , TiO 2 , CuO), or transition metals (Fe, Mn, Zn, Co, Ag) during the polishing process.
- soft functionalized particles generally comprise a soft surface coating portion that is 0.001 monolayers to 10 monolayers thick on an abrasive surface, wherein the soft surface comprises an insoluble compound of a transition metal that has a Knoop Hardness of 900 Kg/mm 2 when measured in its bulk form.
- soft surfaces can include, water insoluble transition metal comprising compounds, such as oxides, chloride, carbonates, nitrates, sulfates of transition metals.
- the soft surfaces can also include elements and alloys of transition elements.
- the transition metals can include copper, or manganese, zinc, iron, titanium, cerium, cobalt, silver located in Periods 4, 5, and 6 of the periodic table.
- Soft surface as used herein can also include certain polymeric materials including PMMA, polystyrene, and polyurethane.
- the soft surface transition metal compound can comprise an Mn comprising compound in which Mn is in the Mn +0 state, or Mn +3 or Mn +4 oxidation states.
- the Mn comprising compound can consist essentially of at least one of MnO 2 and MnCl 3 and thus essentially be the only particles in the slurry.
- the estimated Mohs hardness for both of these materials is ⁇ 3.
- Such particles generally have a size from 0.5 nm to 100 nm.
- the concentration of the soft particles can vary from 0.0000001% to 50% by weight.
- Other examples of soft surfaces include, cerium oxide, zinc oxide, copper oxide, nitrides, carbonates oxides of transition metals, transition metals and forms of silica having a Mohs hardness of ⁇ 6, including nanoporous silica (i.e.
- nanoporous silica particles can be formed by a modified Stober process (W. Stober, A. Fink, E. Bohn, J. Colloids and Interfacial Science, 26, 62-69 (1968)).
- the particle size in this embodiment can vary from 20 nm to 500 nm, while the porosity can vary from 10 to 60%. As the porosity of the surface increases, the numbers of adsorption sites are expected to decrease.
- the particle size of soft surfaced particles can generally vary from 1 nm to 100 microns.
- the concentration of particles can vary from 0.000001 weight percent to 50 weight percent of the slurry.
- the soft surface composition can be coated onto a core particle that has a higher hardness, such as a hard abrasive, to form soft surfaced composite particles.
- the composite particles can comprise a core having a first hardness and a coating of the soft surface on the core having a second hardness, wherein the second hardness ⁇ the first hardness by at least one (1) Mohs number or at least a Knoop hardness of 100 Kg/mm 2 . For example, if the hardness of the coating has a Mohs number of 3, then the hardness of the core particle is at least a Mohs number of 4.
- Inorganic core particles for the soft surface coated particles can be silica, titania nanoporous particles, silicon nitride, alumina, yttria, zirconia, diamond, ceria. Core particles can also be multiphase particles, where the cores are coated or mixed with another layer.
- the primary size of the core particles can vary from 2 nm to 100 microns. The size can be between 10 nm to 1000 nm. The primary particle size refers to the minimum unaggregated size of the particles.
- the surface coatings can be continuous or discrete and provide 2% to 100% core particle surface area coverage.
- the thickness of the soft coatings can vary from 0.5 nm to 500 nm. In one embodiment, the thickness of the solid coating is between 10 nm to 100 nm.
- Example of composite particles include coatings of water insoluble compounds of transitions metals (e.g. MnO 2 , ZnO, Cerium oxide, copper oxide, cobalt oxide, iron oxide, MnCl 3 , other chlorides, nitrides, carbonates, of transition materials, transition metals) on silica, ceria, alumina, titania, silicon carbide, silicon nitride, boron nitride, or diamond particles.
- the size of the composite particles is generally from 1 nm to 100 microns.
- the concentration of composite particles can vary from 0.000001 weight percent to 50 weight percent of the slurry.
- the particles include soft surface particles and particles having a hard abrasive surface.
- Soft functionalized particles typically comprise ultra thin coatings with partial or complete surface coverage which can alter the properties of the particles but may not be visually different from a uncoated particle.
- the functionalized particles can comprise a core having a first hardness and a coating of the soft functionalization on the core having a second hardness if measured in bulk form, wherein the second hardness ⁇ the first hardness by at least one (1) Mohs number or at least a Knoop hardness of 100 Kg/mm 2 .
- the hardness of the functionalized surface material in bulk form has a Mohs number of 3, then the hardness of the core particle is at least a Mohs number of 4.
- Example of a hard core abrasives include, are but not limited to, silica, alumina, titania, ceria, silicon nitride, silicon carbide, boron nitride and diamond.
- Example of functionalized surfaces of core particles include water insoluble compounds of transitions metals (e.g. MnO 2 , ZnO, Cerium oxide, copper oxide, cobalt oxide, iron oxide, MnCl 3 , other chlorides, nitrides, alkoxides, carbonates, of transition materials, transition metals including zinc, manganese, copper, cobalt, and from period 3, 4 and 5 of the periodic table) on silica, ceria, alumina, titania, silicon carbide, silicon nitride, boron nitride, or diamond particles.
- the size of the functionalized particles is generally from 1 nm to 100 microns.
- the concentration of functionalized particles can vary from 0.000001 weight percent to 50 weight percent of the slurry.
- the functionalization and coatings on core particles can be achieved by various means including physical vapor deposition, chemical vapor deposition, and wet chemistry methods.
- wet chemistry methods the core particles can be immersed into a liquid which can breakdown to form insoluble compounds that can functionalize/coat the surface of the core particles.
- the breakdown of the liquid into insoluble products can occur by external action including addition of at least one other chemical to the slurry solution containing the original chemical and the core particle.
- the second chemical may help to break down the original chemical to form insoluble compounds that can coat the surface of the particles.
- the breakdown of the coatings/functionalization chemicals can occur by other means including stirring, heating, presence of light, or keeping the particles mixed with an chemicals for an extended period of time greater than 30 minutes.
- the time to functionalize the surface will generally be less than 5 minutes.
- the occurrence of the functionalization can be determined from change in the property of the functionalized particles including but not limited to change in color of the particle, dispersion characteristics, particle flow behavior, coagulation, optical, electrical magnetic, electronic, mechanical and other properties.
- One method of observing functionalization/coating is to observe the change in color of the particle or change in dispersion characteristics of the particle.
- the dispersion characteristics of a silica particle are observed in the acidic pH range (pH 2 to pH 7).
- colloidal silica particles in the pH range of 4 to 7 are unstable and can gel to form large networks of particles that cannot be redispersed.
- Functionalization of the core abrasive silica particle can reduce or eliminate the gelation process so that the particles can be easily redispersed.
- both coated particles and/or soft functionalized particles may be mixed with abrasives particles such as silica, alumina, zirconia, diamond, boron nitride.
- abrasives particles such as silica, alumina, zirconia, diamond, boron nitride.
- the percentage of coated/functionalized particles compared to total particles can vary from 5% to 100%.
- the oxidizing agent can comprise a peroxide such as hydrogen peroxide, ammonium cerium nitrate, periodates, periodic acid, iodates, persulfates, chromates, permanganates, ferricyanides, bromates, perbromates, ferrates, perrhenates, perruthenates, and mixtures thereof.
- the oxidizing agent comprise a water soluble transition metal compound that provides transition metal ions, such as Mn.
- water soluble transition metal based oxidizers include permanganates, such as KMnO 4 .
- permanganate is the general name for a chemical compound containing the manganate (VII) ion, (MnO 4 —).
- Ferricyanides is another class of water soluble transition metal compounds. As known in the chemical arts, ferricyanide is the anion [Fe(CN) 6 ] 3 —.
- the oxidizers can include compounds after reaction form insoluble transition metal compounds. For example, the permanganate ion can form insoluble manganese oxide, and chromate based oxidizers can form the chromium oxide.
- surfactant refers to a material having both a lipophilic component and a hydrophilic component, and includes surface active polymers.
- surfactants are generally classified by the presence of formally charged groups in its head, with non-ionic, cationic, anionic, and cationic surfactants. If a surfactant contains a head with two oppositely charged groups, it is termed zwitterionic. All surfactant types can generally be used with embodiments of the invention.
- the concentration of surfactants used depends on the type of the surfactant used, the surfaces of particles and wafers. At low concentrations, the surfactant may adsorb onto the solid surfaces in a patchy manner and change the electrostatic properties and the surface energy of the surface. The adsorption of the surfactant under these conditions may reduce the etching of the surface layer. At higher concentrations of the surfactant, the surfactant molecules may coalesce together to form self-assembled structures. Examples of structured surfactants can include spheres, cylindrical rods, bi-layers, disks and vesicles. Once the bulk critical micelle concentration (CMC) is reached, the surface tension of the solution does not generally decrease any further, but is accompanied by a rapid drop in the electrical conductivity of the bulk solution.
- CMC bulk critical micelle concentration
- the surfactant concentration is at least 0.0001 of the CMC for non-ionic surfactactants and at least 0.001 CMC of cationic and anionic surfactactants.
- the soft coating or soft coating portion may also help ensure non-gelling of the slurry particles.
- the slurry may also include other additives including salts, biocides, pH stabilizing agents, and soluble ions of various elements including alkali and transitions metals.
- the salt can comprise KI, KBr, KCO 3 , KCl, NH 4 I or NH 4 Cl.
- the concentration of the salt can range from 0.001M to 5M.
- the pH of the slurry can vary from 0.1 to 13.9, although during CMP processing the pH of the slurry is generally ⁇ 8, or ⁇ 5 such as 2 to 5. During storage, particularly when the oxidizing agent comprises permanganate, the pH of the slurry is generally ⁇ 8.
- an acid such as nitric acid can be used to reduce the pH to raise the removal rate as evidenced in the examples described below.
- the silicon carbide comprising surfaces can be in the form of a substrate (e.g. a wafer having a thickness greater than 100 microns) or in the form of a thin or thick film (with a thickness less than 100 microns).
- the silicon carbide comprising film can be single crystal, polycrystalline or have an amorphous structure.
- the surface of the silicon carbide comprising material can be either carbon face, silicon face, or a mixture or amorphous in nature.
- the silicon-carbide surface can also be composed of materials in non-stochiometric amorphous can be materials in a dielectric form (such as carbon doped silicon oxide or carbon doped silicon nitride) used in low k (dielectric constant less than 4) applications with a overall composition of Si x —C y —N z —O a where x, y, can vary from 0.05 to 0.95, while z, a can vary from 0.00 to 0.90.
- dielectric films can be used in formation of copper based interconnects, metal gate electronics or generally any dielectric films application in the silicon based semiconductor industry.
- Slurries according to embodiments of the invention can be premixed or mixed in situ during the CMP process.
- premixed slurries may be stored in alkaline pH conditions and acid added before CMP use.
- a first and second water soluble composition are dissolved in water which react and form soft insoluble particles or coat core particles if provided in the slurry to form composite particles having a soft surface.
- the CMP pad is also coated with the insolubles.
- An oxidizer can be added, or be one of the water soluble compositions provided in stoichiometric excess.
- Polishing of silicon carbide comprising materials according to embodiments of the invention can benefit a wide variety of applications.
- embodiments of the invention can be used in applications such as dielectric films in semiconductor integrated circuits, optoelectronic devices such as light emitting devices (LEDs) and lasers, microelectromechanical systems (MEMS) based devices, and biomedical systems.
- LEDs light emitting devices
- MEMS microelectromechanical systems
- Embodiments of the present invention are further illustrated by the following specific Examples, which should not be construed as limiting the scope or content of embodiments of the invention in any way.
- Soft particles comprising MnCl 3 and manganese oxide MnO 2 were prepared by adding 0.023M MnCl 2 (which is water soluble) to a 0.015 KMnO 4 solution.
- Insoluble manganese compounds MnCl 3 an example of Mn(III) state compound
- MnO 2 an example of Mn(IV) compound
- MnCl 3 an example of Mn(III) state compound
- MnO 2 an example of Mn(IV) compound
- the slurry was used to a polish a silicon face SiC substrate (wafer).
- the polishing system comprised a Buehler apparatus running at 50-200 rpm and at a pressure from 0.1 to 10 psi. In these examples the pressure was 6.4 psi and the rotation speed was 90 rpm.
- the removal rates shown below were obtained using the above described slurry. Note the very high removal rates obtained, such as >500 nm/hr.
- the soft surface comprised MnCl 3 and MnO 2 as described above in Example 1.
- the polishing using such coated particles were compared to polishing using uncoated silica particles. A significant increase in removal rate is demonstrated even in absence of the oxidizer.
- the soft surface comprised MnCl 3 and MnO 2 on various core particles described above in example 1.
- KMnO 4 was added as an oxidizer.
- the oxidizer concentration was 0.35 M
- pH Core Particle RR (nm/hr) 3 Silica 135 nm 1350 3 Alumina 800 nm 1800 3 Diamond 0.2 micron 2300 3 Alumina 300 nm 1700 Comparing example 1 to example 3, the addition of the KMnO 4 is seen to increase the RR about an order of magnitude.
- Atomic force microscopy of the SiC surfaces provided using both coated particles and soft functionalized particle based slurries is shown in this example.
- the surfaces of silicon faced SiC samples were polished using different concentration of oxidizers, types and concentrations of particles.
- the polishing equipment and the conditions were the same as outlined in the Example 1 as described above.
- AFM data was obtained for the surface of the silicon face on-axis 6H SiC wafer after polishing with a soft functionalized particles slurry having silica cores (0.1 M KMnO 4 , 75 nm silica soft functionalized with insoluble Mn +3 and Mn +4 compounds (oxides and/or chlorides).
- the area of the AFM scan was 10 micron by 10 microns.
- the functionalization was provided by stirring the silica particles in permanganate solution for 10 minute in acidic pH conditions followed by polishing.
- the AFM of the resulting surface evidenced terraced structures which correspond to the atomic planes in the SiC each terrace corresponding to with a height of about 2.5 A.
- the root mean square surface roughness was less than 2 A.
- alumina coated particles were found to provide different surface terracing. However, the surfaces formed were very smooth. AFM data obtained for the surface of Si faced 6H SiC surface polished with 1% percent Mn(III)/Mn(IV) coated alumina with 0.35 M KMnO 4 slurry. The rms surface roughness was found to be less than 2 A. The terracing was found to be different as compared to the terracing obtained using silica particles.
- AFM data was obtained for 6H silicon faced SiC carbide polished with 0.1% 5 nm coated diamond and 1% 75 nm coated silica (coating is Mn(III)/Mn(IV) compounds) with 0.3 M KMnO 4 oxidizer.
- An excellent surface finish was found having an with rms less than 2 A, with no detection of scratches. Low roughness of polishing can also be expected from other polytypes of silicon carbide, single crystal, polycrystal or amorphous materials.
- the polishing rate can be enhanced if the coated particles or soft functionalized particles are mixed with hard abrasives.
- the table below shows the removal rate of SiC silicon faced 6H substrates using various mixed particle systems. In each case the concentration of the KMnO 4 oxidizer was kept at 0.3 M with pH 3.0.
- the coating refers to Mn(III)/Mn(IV) coating on the core.
- the polishing rate for SiC was found to depend on the nature of the silicon carbide surface.
- the carbon faced SiC was found to polish at much higher rates as compared to the silicon faced SiC material.
- the polishing rate for the silicon face was 1,475 nm/hr, while of the carbon face was approximately 5,000 nm/hr. This high removal rate was attributed to the rapid reaction of the carbon with the slurry chemistry.
- Slurry according to embodiments of the invention generally have higher polishing rates for amorphous SiC comprising materials that can have varying contents of carbon and or silicon.
- a material of this type is BD1 which is a low dielectric constant material manufactured by Applied Materials (Santa Clara, Calif.). This material has a trade name of Black Diamond This material has varying amounts of Si—C—O and can also be doped with nitrogen.
- the removal rate at PH 3.0 using 1% coated 75 nm silica particles at 2 psi was found to be 1374 A/min, as compared 168 A/min for uncoated silica particles.
- the formation of soft functionalized particles can be obtained by breaking down chemicals in the presence of core (e.g. abrasive) particles. If the breakdown is very slow, the coating on the core particles may be very thin that may not be easily discernable by visual means.
- the functionalization of cores can be determined by observing the flow, agglomeration, or redispersion or gelling behavior of the particles.
- abrasive diamond, silica and alumina particles were immersed in 0.3M KmO 4 solution for extended period exceeding 10 minutes. The slurries were stirred and were exposed to standard artificial lighting conditions. The particle concentration was varied from 0.1 percent to 20 percent.
- the pH for monitoring was typically in the acid environments (pH 2 to pH 7).
- the particle characteristics we observed and compared with similar concentration particles that we not dipped in permanganate solution. To compensate for the permanganate a similar amount of salt KCl was added to the particle solution. The following observation were made.
- the silica based colloidal solution in absence of permanganate solution typically gelled (formed a glob) in acidic pH conditions. The gelling rate varied from several minutes to days depending on the concentration of particles and the salt concentration. Such gelling made the slurry unusable for CMP applications.
- the KMnO 4 treated silica particles in acidic environments did not gel under any concentration conditions, thus suggesting functionalization of the particles with modification of the surface characteristics.
- the gelling behavior of the functionalized particles was found to be similar to the Mn(III)/Mn(IV) coated particles suggesting a very thin functionalization layer can significantly alter the gelling characteristics.
- the alumina and diamond functionalized particles also showed unique flow characterstics. The redispersion of the particles was much easier compared to non-functionalized particles.
Abstract
Description
- Embodiments of the present invention relate to chemical mechanical polishing (CMP) of silicon carbide comprising materials, such as for fabricating integrated circuits (ICs) including silicon carbide comprising materials.
- Silicon carbide possesses unique electrical and physical properties that make it suitable for high power, high frequency and high temperature electronic devices including ICs. Such properties have fueled an intense research effort in the last several years that has prompted the need to develop larger sized, epi-ready and substantially defect/damage-free silicon carbide wafers.
- The preparation of silicon carbide wafers is known to require multiple polishing steps including a mechanical polishing step in which particles which are typically harder than silicon carbide (Mohs hardness of 9, Knoop hardness 2,400-3,000 Kg/mm2), such as boron nitride (BN; Mohs hardness of 9.9, Knoop hardness 4,500-5,000 Kg/mm2) or diamond (Mohs hardness of 10, Knoop hardness 8,000-12,000 Kg/mm2) or Boron Carbide (Mohs hardness 9.35, Knoop hardness 2,900-3,580 Kg/mm2) are used to achieve reasonable silicon carbide polishing rates. The very hard particles required for the mechanical polishing step generally results in a high degree of damage to the silicon carbide surface including scratches and dislocations which generally develop both at the surface and sub-surface of the wafer. The mechanical polishing step is typically followed by a CMP step which uses particles that are still abrasive, but are less abrasive as compared to diamond or BN, such as aluminum oxide (Mohs hardness about 9, Knoop hardness 1,800-2,200 Kg/mm2), titania (Mohs hardness of 5.5 to 6.5 Knoop Hardness 500-600 Kg/mm2), or Garnet Mohs hardness about 8, Knoop hardness 1360 Kg/mm2, silica/quartz (Mohs hardness of 7, Knoop Hardness 900-1,200 Kg/mm2), or zirconia (Mohs hardness about 8, Knoop hardness 1,120 Kg/mm2 to polish the surface regions and attempt to reduce the surface and sub-surface damage induced by the mechanical polishing.
- Typically the abrasives that are harder than silicon carbide provide reasonably high polishing rates, but cause significant surface and sub-surface damage. The abrasives which are softer than silicon carbide typically provide low polishing rates, and significantly less damage. Since the CMP particles used are still significantly abrasive, new damage is generated during the CMP process. Moreover, since silicon carbide and silicon carbide comprising materials are generally chemically inert materials, the CMP process typically is very slow, and thus requires a long cycle time, as the slurry chemicals do not react with the silicon carbide comprising surface. Therefore, there is a need to develop new CMP slurries and/or methods for polishing silicon carbide comprising materials which decrease damage and increase the polishing rate.
- This Summary is provided to comply with 37 C.F.R. § 1.73, presenting a summary of the invention to briefly indicate the nature and substance of the invention. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
- Embodiments of the present invention describe slurry compositions and chemically activated CMP methods for polishing a substrate having a silicon carbide comprising surface using such slurries. In such methods, the silicon carbide comprising surface is contacted with a CMP slurry composition that comprises i) a liquid (e.g. water) carrier, ii) and a plurality of particles having at least a soft surface portion, wherein the soft surface portion comprises a transition metal compound that provides a Mohs hardness ≦6 or Knoop Hardness less than 900 Kg/mm2. Optionally, iii) an oxidizing agent can be added. The slurry is moved relatively near or close to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide comprising surface is removed.
- The soft surfaced particles can be what are referred to herein as “coated particles” in some embodiments of the invention or “soft functionalized particles” in other embodiments of the invention. Soft functionalized particles generally comprise a thin soft surface coating comprising a water insoluble compound of a transition metal on an abrasive surface. Soft functionalization is defined herein as the arrangement where the thickness of the transition metal comprising coating on the core particles is between 0.001 monolayers to 10 monolayers, and comprised of transition metal comprising materials that have a Knoop Hardness of 900 Kg/mm2 when measured in their bulk form. The soft surface coating of the soft functionalized particles can be a discontinuous or continuous coating, and its thin nature results in its surface properties generally being different from the core but having a hardness that will generally be similar to the core. In contrast, coated particles have a coating that is generally a continuous coating that is thicker and is typically much thicker (e.g. >10 monolayers to 100,000 monolayers (about 30 microns)) as compared to the coating for the soft functionalized particles, and its surface properties surface properties and hardness will generally be controlled by the coating and thus be different from the core.
- The soft surfaced particles in slurries according to embodiments of the invention have been found to unexpectedly provide high polishing rates considering the much harder and highly inert silicon carbide comprising surface, such as removal rates of ≧200 nm/hr. Moreover, slurries according to embodiments of the invention have been found to significantly reduce surface and sub-surface damage present from earlier processing. Accordingly, embodiments of the invention provide new CMP slurries and related methods for polishing silicon carbide comprising materials which significantly increase the polishing rate and decrease damage to the silicon carbide comprising surface.
-
FIG. 1 shows steps in an exemplary method of chemical mechanical polishing of a silicon carbide comprising surface, according to an embodiment of the invention. - The present invention is described with reference to the attached figures, wherein like reference numerals are used throughout the figures to designate similar or equivalent elements. The figures are not drawn to scale and they are provided merely to illustrate the instant invention. Several aspects of the invention are described below with reference to example applications for illustration. It should be understood that numerous specific details, relationships, and methods are set forth to provide a full understanding of the invention. One having ordinary skill in the relevant art, however, will readily recognize that the invention can be practiced without one or more of the specific details or with other methods. In other instances, well-known structures or operations are not shown in detail to avoid obscuring the invention. The present invention is not limited by the illustrated ordering of acts or events, as some acts may occur in different orders and/or concurrently with other acts or events. Furthermore, not all illustrated acts or events are required to implement a methodology in accordance with the present invention.
-
FIG. 1 shows steps in anexemplary method 100 of chemical mechanical polishing a substrate having a silicon carbide comprising surface, according to an embodiment of the invention.Step 101 comprises providing a chemical-mechanical polishing slurry composition. The slurry composition comprises i) a liquid (e.g. water) carrier, and ii) a plurality of particles having at least a soft surface portion, wherein the soft surface portion comprises a transition metal compound that provides a Mohs hardness ≦6 or a Knoop Hardness less than 900 Kg/mm2. Optionally, the slurry composition can further comprise iii) an oxidizing agent, wherein the oxidizing agent comprises a transition metal ion. -
Step 102 comprises contacting the silicon carbide comprising surface with the slurry composition.Step 103 comprises moving the slurry composition relatively near or close to relative to the silicon carbide comprising surface, wherein at least a portion of the silicon carbide comprising surface is removed. - The silicon carbide comprising surface can generally be of any orientation. For silicon face, carbon face, mixed face, m-face, a-face, generally any miscut from regular crystallographic faces, any polytype, mixed polytype, doped, undoped, polycrystalline, amorphous, cubic or hexagonal symmetry. In some embodiments, especially thin films, silicon and carbon can mixed with other compounds, such as boron, aluminum, oxygen and nitrogen.
- As mentioned above, the soft surfaced particles in slurries according to embodiments of the invention have been found to unexpectedly provide a high polishing rate for the much harder and highly inert silicon carbide comprising surface, such as a removal rate ≧200 nm/hr, including removal rates >1,000 nm/hr (>1 μm/hr), along with a significant reduction in surface and sub-surface damage that is left over from prior polishing using a harder abrasive. Although not required to practice embodiments of the present invention, the Present Inventors provide herein some mechanisms believed to be operable that can be used to explain the unexpectedly high removal rate provided by CMP processing with the use of particles having a soft surface according to embodiments of the invention.
- CMP processes according to embodiments of the invention may generally be based on catalytic breakdown of the oxidizing agent which provides reactive species that increase the removal rate. The catalytic action can be enhanced by one or more of higher temperature (e.g. 35 to 90° C.), rubbing action during the CMP process, presence of insoluble compounds and elements of transition metals, functionalization of the surface of a particle with insoluble elements or compounds of transition metals, presence of soluble transition metal ions, increase in friction during the polishing, formation of insoluble transition metal compound during polishing as a result of breakdown of the oxidizer, or coating of pad surface with a transition metal oxide or insoluble compound.
- Examples of oxidizers than can be catalytically accelerated include peroxides, permanganates, perchlorates, and oxidizers containing transition metal elements such as permanganates, ferrocyanides, ferricyanides, chromates, cerium ammonium nitrates. Examples of oxidizers that breakdown into insoluble compounds of transition elements include permanganates and chromates. Examples of oxidizers than breakdown into insoluble products that generally coat the polishing pad include, permanganates, and chromates. The pad coating can be in form insoluble surface films as a result of byproducts from the slurry. The term “byproducts” as used herein refers to insoluble compounds formed from either the breakdown of the oxidizers or reactant products from the chemicals in the slurry and the silicon carbide comprising surface.
- The catalytic action can be accelerated by a local temperature increase that can occur during the polishing process itself. In another embodiment, the temperature can be increased by providing an external heating source, such as heated slurries, heating of the pad and polishing apparatus using lamps, and resistively heating sources. The catalytic action can also be provided by ultraviolet (UV) breakdown using high photon energy sources such as UV lamps. The catalytic action can be accelerated also by the presence of soluble ions (e.g. transition metal ions of manganese, zinc, chromium, iron, cobalt, copper,) insoluble soft surface compositions (e.g. transition metal (Mn, Cu, Zn, Co, Fe, Ni) oxides, nitrides, chlorides, sulfates, nitrates carbonates (e.g. MnO2, MnCl3, TiO2, CuO), or transition metals (Fe, Mn, Zn, Co, Ag) during the polishing process.
- The catalytic action can be also be accelerated by soft functionalization to form soft functionalized particles. As defined above, soft functionalized particles generally comprise a soft surface coating portion that is 0.001 monolayers to 10 monolayers thick on an abrasive surface, wherein the soft surface comprises an insoluble compound of a transition metal that has a Knoop Hardness of 900 Kg/mm2 when measured in its bulk form.
- Examples of soft surfaces can include, water insoluble transition metal comprising compounds, such as oxides, chloride, carbonates, nitrates, sulfates of transition metals. The soft surfaces can also include elements and alloys of transition elements. The transition metals can include copper, or manganese, zinc, iron, titanium, cerium, cobalt, silver located in Periods 4, 5, and 6 of the periodic table. “Soft surface” as used herein can also include certain polymeric materials including PMMA, polystyrene, and polyurethane. In a specific embodiment, the soft surface transition metal compound can comprise an Mn comprising compound in which Mn is in the Mn+0 state, or Mn+3 or Mn+4 oxidation states. For example, the Mn comprising compound can consist essentially of at least one of MnO2 and MnCl3 and thus essentially be the only particles in the slurry. In the case of MnO2 and MnCl3 particles, the estimated Mohs hardness for both of these materials is <3. Such particles generally have a size from 0.5 nm to 100 nm. The concentration of the soft particles can vary from 0.0000001% to 50% by weight. Other examples of soft surfaces include, cerium oxide, zinc oxide, copper oxide, nitrides, carbonates oxides of transition metals, transition metals and forms of silica having a Mohs hardness of ≦6, including nanoporous silica (i.e. having nanosized pores), as well as other nanoporous materials including porous alumina. For example, nanoporous silica particles can be formed by a modified Stober process (W. Stober, A. Fink, E. Bohn, J. Colloids and Interfacial Science, 26, 62-69 (1968)). The particle size in this embodiment can vary from 20 nm to 500 nm, while the porosity can vary from 10 to 60%. As the porosity of the surface increases, the numbers of adsorption sites are expected to decrease.
- The particle size of soft surfaced particles can generally vary from 1 nm to 100 microns. In this embodiment, the concentration of particles can vary from 0.000001 weight percent to 50 weight percent of the slurry.
- In some embodiments of the invention the soft surface composition can be coated onto a core particle that has a higher hardness, such as a hard abrasive, to form soft surfaced composite particles. In this embodiment, the composite particles can comprise a core having a first hardness and a coating of the soft surface on the core having a second hardness, wherein the second hardness<the first hardness by at least one (1) Mohs number or at least a Knoop hardness of 100 Kg/mm2. For example, if the hardness of the coating has a Mohs number of 3, then the hardness of the core particle is at least a Mohs number of 4. Another example includes if the Knoop hardness of the coatings is 200 Kg/mm2, the hardness of the core is at least 300 Kg/mm2. Inorganic core particles for the soft surface coated particles can be silica, titania nanoporous particles, silicon nitride, alumina, yttria, zirconia, diamond, ceria. Core particles can also be multiphase particles, where the cores are coated or mixed with another layer. The primary size of the core particles can vary from 2 nm to 100 microns. The size can be between 10 nm to 1000 nm. The primary particle size refers to the minimum unaggregated size of the particles. The surface coatings can be continuous or discrete and provide 2% to 100% core particle surface area coverage. The thickness of the soft coatings can vary from 0.5 nm to 500 nm. In one embodiment, the thickness of the solid coating is between 10 nm to 100 nm.
- Example of composite particles include coatings of water insoluble compounds of transitions metals (e.g. MnO2, ZnO, Cerium oxide, copper oxide, cobalt oxide, iron oxide, MnCl3, other chlorides, nitrides, carbonates, of transition materials, transition metals) on silica, ceria, alumina, titania, silicon carbide, silicon nitride, boron nitride, or diamond particles. The size of the composite particles is generally from 1 nm to 100 microns. The concentration of composite particles can vary from 0.000001 weight percent to 50 weight percent of the slurry. In yet another embodiment, the particles include soft surface particles and particles having a hard abrasive surface.
- Soft functionalized particles typically comprise ultra thin coatings with partial or complete surface coverage which can alter the properties of the particles but may not be visually different from a uncoated particle. In this embodiment, the functionalized particles can comprise a core having a first hardness and a coating of the soft functionalization on the core having a second hardness if measured in bulk form, wherein the second hardness<the first hardness by at least one (1) Mohs number or at least a Knoop hardness of 100 Kg/mm2. For example if the hardness of the functionalized surface material in bulk form has a Mohs number of 3, then the hardness of the core particle is at least a Mohs number of 4. Another example includes if the Knoop hardness of the surface functionalization material in bulk form is 200 Kg/mm2, the hardness of the core particle is at least 300 Kg/mm2. Example of a hard core abrasives include, are but not limited to, silica, alumina, titania, ceria, silicon nitride, silicon carbide, boron nitride and diamond.
- Example of functionalized surfaces of core particles include water insoluble compounds of transitions metals (e.g. MnO2, ZnO, Cerium oxide, copper oxide, cobalt oxide, iron oxide, MnCl3, other chlorides, nitrides, alkoxides, carbonates, of transition materials, transition metals including zinc, manganese, copper, cobalt, and from period 3, 4 and 5 of the periodic table) on silica, ceria, alumina, titania, silicon carbide, silicon nitride, boron nitride, or diamond particles. The size of the functionalized particles is generally from 1 nm to 100 microns. The concentration of functionalized particles can vary from 0.000001 weight percent to 50 weight percent of the slurry.
- The functionalization and coatings on core particles can be achieved by various means including physical vapor deposition, chemical vapor deposition, and wet chemistry methods. Using wet chemistry methods, the core particles can be immersed into a liquid which can breakdown to form insoluble compounds that can functionalize/coat the surface of the core particles. The breakdown of the liquid into insoluble products can occur by external action including addition of at least one other chemical to the slurry solution containing the original chemical and the core particle. The second chemical may help to break down the original chemical to form insoluble compounds that can coat the surface of the particles. The breakdown of the coatings/functionalization chemicals can occur by other means including stirring, heating, presence of light, or keeping the particles mixed with an chemicals for an extended period of time greater than 30 minutes.
- In the presence of UV light the time to functionalize the surface will generally be less than 5 minutes. The occurrence of the functionalization can be determined from change in the property of the functionalized particles including but not limited to change in color of the particle, dispersion characteristics, particle flow behavior, coagulation, optical, electrical magnetic, electronic, mechanical and other properties. One method of observing functionalization/coating is to observe the change in color of the particle or change in dispersion characteristics of the particle. In one embodiment the dispersion characteristics of a silica particle are observed in the acidic pH range (pH 2 to pH 7). Typically, colloidal silica particles in the pH range of 4 to 7 are unstable and can gel to form large networks of particles that cannot be redispersed. Functionalization of the core abrasive silica particle can reduce or eliminate the gelation process so that the particles can be easily redispersed.
- In another embodiment, both coated particles and/or soft functionalized particles may be mixed with abrasives particles such as silica, alumina, zirconia, diamond, boron nitride. The percentage of coated/functionalized particles compared to total particles can vary from 5% to 100%.
- The oxidizing agent can comprise a peroxide such as hydrogen peroxide, ammonium cerium nitrate, periodates, periodic acid, iodates, persulfates, chromates, permanganates, ferricyanides, bromates, perbromates, ferrates, perrhenates, perruthenates, and mixtures thereof. In one specific embodiment, the oxidizing agent comprise a water soluble transition metal compound that provides transition metal ions, such as Mn. Examples of water soluble transition metal based oxidizers include permanganates, such as KMnO4. As known in the chemical arts, permanganate is the general name for a chemical compound containing the manganate (VII) ion, (MnO4—). Ferricyanides is another class of water soluble transition metal compounds. As known in the chemical arts, ferricyanide is the anion [Fe(CN)6]3—. The oxidizers can include compounds after reaction form insoluble transition metal compounds. For example, the permanganate ion can form insoluble manganese oxide, and chromate based oxidizers can form the chromium oxide.
- It is also generally desirable to ensure that the slurry particles do not gel in a colloidal suspension in the normally high ionic strength slurry. The Present Inventors have found that slurry stability can generally be improved by a surfactant because surfactant covered particles repel one another and as a result tend not to agglomerate. As used herein, the term “surfactant” refers to a material having both a lipophilic component and a hydrophilic component, and includes surface active polymers. As known in the art, surfactants are generally classified by the presence of formally charged groups in its head, with non-ionic, cationic, anionic, and cationic surfactants. If a surfactant contains a head with two oppositely charged groups, it is termed zwitterionic. All surfactant types can generally be used with embodiments of the invention.
- The concentration of surfactants used depends on the type of the surfactant used, the surfaces of particles and wafers. At low concentrations, the surfactant may adsorb onto the solid surfaces in a patchy manner and change the electrostatic properties and the surface energy of the surface. The adsorption of the surfactant under these conditions may reduce the etching of the surface layer. At higher concentrations of the surfactant, the surfactant molecules may coalesce together to form self-assembled structures. Examples of structured surfactants can include spheres, cylindrical rods, bi-layers, disks and vesicles. Once the bulk critical micelle concentration (CMC) is reached, the surface tension of the solution does not generally decrease any further, but is accompanied by a rapid drop in the electrical conductivity of the bulk solution.
- In one embodiment, the surfactant concentration is at least 0.0001 of the CMC for non-ionic surfactactants and at least 0.001 CMC of cationic and anionic surfactactants. As described above, the soft coating or soft coating portion may also help ensure non-gelling of the slurry particles.
- The slurry may also include other additives including salts, biocides, pH stabilizing agents, and soluble ions of various elements including alkali and transitions metals. For example, the salt can comprise KI, KBr, KCO3, KCl, NH4I or NH4Cl. The concentration of the salt can range from 0.001M to 5M.
- The pH of the slurry can vary from 0.1 to 13.9, although during CMP processing the pH of the slurry is generally ≦8, or <5 such as 2 to 5. During storage, particularly when the oxidizing agent comprises permanganate, the pH of the slurry is generally ≧8. To prepare for use, an acid, such as nitric acid can be used to reduce the pH to raise the removal rate as evidenced in the examples described below.
- The silicon carbide comprising surfaces can be in the form of a substrate (e.g. a wafer having a thickness greater than 100 microns) or in the form of a thin or thick film (with a thickness less than 100 microns). The silicon carbide comprising film can be single crystal, polycrystalline or have an amorphous structure. The surface of the silicon carbide comprising material can be either carbon face, silicon face, or a mixture or amorphous in nature. The silicon-carbide surface can also be composed of materials in non-stochiometric amorphous can be materials in a dielectric form (such as carbon doped silicon oxide or carbon doped silicon nitride) used in low k (dielectric constant less than 4) applications with a overall composition of Six—Cy—Nz—Oa where x, y, can vary from 0.05 to 0.95, while z, a can vary from 0.00 to 0.90. Such dielectric films can be used in formation of copper based interconnects, metal gate electronics or generally any dielectric films application in the silicon based semiconductor industry.
- Slurries according to embodiments of the invention can be premixed or mixed in situ during the CMP process. As described above, premixed slurries may be stored in alkaline pH conditions and acid added before CMP use. In a typical embodiment, a first and second water soluble composition are dissolved in water which react and form soft insoluble particles or coat core particles if provided in the slurry to form composite particles having a soft surface. The CMP pad is also coated with the insolubles. An oxidizer can be added, or be one of the water soluble compositions provided in stoichiometric excess.
- Polishing of silicon carbide comprising materials according to embodiments of the invention can benefit a wide variety of applications. For example, embodiments of the invention can be used in applications such as dielectric films in semiconductor integrated circuits, optoelectronic devices such as light emitting devices (LEDs) and lasers, microelectromechanical systems (MEMS) based devices, and biomedical systems.
- Embodiments of the present invention are further illustrated by the following specific Examples, which should not be construed as limiting the scope or content of embodiments of the invention in any way.
- Soft particles comprising MnCl3 and manganese oxide MnO2 were prepared by adding 0.023M MnCl2 (which is water soluble) to a 0.015 KMnO4 solution. Insoluble manganese compounds MnCl3 (an example of Mn(III) state compound) and MnO2 (an example of Mn(IV) compound) were formed upon the addition of MnCl2. Once the particles were made, a stoichiometric excess of KMnO4 was added in the slurry solution remaining to function as an oxidizer. The insoluble manganese compounds each had a Mohs hardness estimated as <3. The pH of the solutions was adjusted in the range between 2 to 9. The slurry was used to a polish a silicon face SiC substrate (wafer). The polishing system comprised a Buehler apparatus running at 50-200 rpm and at a pressure from 0.1 to 10 psi. In these examples the pressure was 6.4 psi and the rotation speed was 90 rpm. The removal rates shown below were obtained using the above described slurry. Note the very high removal rates obtained, such as >500 nm/hr.
-
pH Concentration KMnO4 (M) Removal Rate nm/hr 2 0.4 1400 4 0.4 1290 6.5 0.4 560 9.0 0.4 360 4.0 0.1 360 3.0 0.02 100 - The soft surface comprised MnCl3 and MnO2 as described above in Example 1. The polishing using such coated particles were compared to polishing using uncoated silica particles. A significant increase in removal rate is demonstrated even in absence of the oxidizer.
-
pH Particle Coating Core Particle part Conc (wt %) RR (nm/hr) 4.5 Mn (III)/Mn (IV) 135 nm silica 10% 84 6.5 Mn (III)/Mn (IV) 135 nm silica 10% 109 6.5 none 135 nm silica 10% 1 to 5 2 Mn (III)/Mn (IV) 135 nm silica 2.8% 119 2 Mn (III)/Mn (IV) alumina 2.8% 162.5 - This example evidences a highly unexpected result, namely, a significantly higher removal rate with the particles having the soft coating (Mohs hardness around 3) as compared to the removal rate with uncoated abrasive core particle (Mohs hardness around 7 for silica, higher for alumina).
- The soft surface comprised MnCl3 and MnO2 on various core particles described above in example 1. KMnO4 was added as an oxidizer. The oxidizer concentration was 0.35 M
-
pH Core Particle RR (nm/hr) 3 Silica 135 nm 1350 3 Alumina 800 nm 1800 3 Diamond 0.2 micron 2300 3 Alumina 300 nm 1700
Comparing example 1 to example 3, the addition of the KMnO4 is seen to increase the RR about an order of magnitude. - Different coated particle in present of different transition metal ion containing oxidizers show significantly higher removal rates compared to uncoated particles or without the use of oxidizers.
-
Removal Sample Slurry transition metal based oxidizer/Soft rate in No Particles nm/hr 1 Potassium dichromate (0.1 mol) + 1% of MnO2 69 coated 135 nm silica particle + water @ pH2 2 Potassium Ferricynide (0.1 mol) + 1% of MnO2 20 coated 135 nm silica particle + water @ pH2 3 Chromium (VI) oxide 2% + 1% 135 nm silica 106 particle + 0.1 mol KMno4 + water @ pH2 4 Potassium Chromate (0.1 mol) + 1% 135 nm silica 87.5 particle + water @ pH2 5 Cupric sulfate (0.1 mol) + 1% 135 nm silica 87.5 particle + water @ pH2 6 Cupric sulfate (0.1 mol) + 1% of MnO2 coated 34 135 nm silica particle + water @ pH2 7 Cobaltous sulfate + 1% 135 nm silica particle water 24 @ pH2 8 Cobaltous sulfate + 1% of MnO2 coated 135 nm 19 silica particle water @ pH2 9 Lithium Cobalt (III) Oxide (1%) + 1% 135 nm 725 silica particle + 0.1 mol KMnO4 + water@ pH2 10 Cupric sulfate (1%) + 1% 135 nm silica particle + 131 0.1 mol KMnO4 + water@ pH2 11 Cerium Oxide coated silica (75 nm) + 0.3 Mol 1320 KMnO4 + water @ pH2 12 1% SiC particle (<1500 grit) + 1% of MnO2 coated 756 135 nm silica particle + 0.3 KMnO4 + water@ pH2 13 1% Boron Nitride particle (0.3 to 0.7 nm) + 1% of 932 MnO2 coated 135 nm silica particle + 0.3 KMnO4 + water @ pH2
The polishing conditions for the data above comprised 6 psi pressure, platen linear velocity of 0.17 m/sec, head rpm 60/min, and the wafer polished a 6H SiC wafer - Atomic force microscopy (AFM) of the SiC surfaces provided using both coated particles and soft functionalized particle based slurries is shown in this example. The surfaces of silicon faced SiC samples were polished using different concentration of oxidizers, types and concentrations of particles. The polishing equipment and the conditions were the same as outlined in the Example 1 as described above.
- AFM data was obtained for the surface of the silicon face on-axis 6H SiC wafer after polishing with a soft functionalized particles slurry having silica cores (0.1 M KMnO4, 75 nm silica soft functionalized with insoluble Mn+3 and Mn+4 compounds (oxides and/or chlorides). The area of the AFM scan was 10 micron by 10 microns. The functionalization was provided by stirring the silica particles in permanganate solution for 10 minute in acidic pH conditions followed by polishing. The AFM of the resulting surface evidenced terraced structures which correspond to the atomic planes in the SiC each terrace corresponding to with a height of about 2.5 A. The root mean square surface roughness was less than 2 A.
- Similar terracing of the surface was obtained when Mn(III)/Mn(iV) coated silica particles were used in a permanganate slurry. The slurry comprised 10% coated 75 nm silica particle+0.3 mole KMnO4 solution. The surface roughness was found to be less than 2 A, while atomic terracing corresponding to 2.5 A was also found. These results were observed on a on-axis 6H SiC wafer on the silicon face. If an off axis wafer is used, no terracing was observed, however the surface roughness was found to be very low (typically less than 2 A). Data obtained showed that the surface of 8 degree of SiC Si faced wafer was polished with 1% coated 135 nm silica particle in a slurry containing 0.3 M KMnO4 solution.
- The use of alumina coated particles was found to provide different surface terracing. However, the surfaces formed were very smooth. AFM data obtained for the surface of Si faced 6H SiC surface polished with 1% percent Mn(III)/Mn(IV) coated alumina with 0.35 M KMnO4 slurry. The rms surface roughness was found to be less than 2 A. The terracing was found to be different as compared to the terracing obtained using silica particles.
- The used of mixed particles was also found to provide high quality surface finishes. AFM data was obtained for 6H silicon faced SiC carbide polished with 0.1% 5 nm coated diamond and 1% 75 nm coated silica (coating is Mn(III)/Mn(IV) compounds) with 0.3 M KMnO4 oxidizer. An excellent surface finish was found having an with rms less than 2 A, with no detection of scratches. Low roughness of polishing can also be expected from other polytypes of silicon carbide, single crystal, polycrystal or amorphous materials.
- The polishing rate can be enhanced if the coated particles or soft functionalized particles are mixed with hard abrasives. The table below shows the removal rate of SiC silicon faced 6H substrates using various mixed particle systems. In each case the concentration of the KMnO4 oxidizer was kept at 0.3 M with pH 3.0. The coating refers to Mn(III)/Mn(IV) coating on the core.
-
Removal Rate Abrasive Particle (nm/hr) 1% coated 135 nm silica particles 1500 1% coated particle + 1% coated 0.8 micron alumina 1900 1% coated particle + 0.1% 0.2 micron diamond BN 1656 - The polishing rate for SiC was found to depend on the nature of the silicon carbide surface. The carbon faced SiC was found to polish at much higher rates as compared to the silicon faced SiC material. Under same polishing conditions using 1% coated particle (used in example 1 pH 3.0) using 0.3 M KMnO4 slurry the polishing rate for the silicon face was 1,475 nm/hr, while of the carbon face was approximately 5,000 nm/hr. This high removal rate was attributed to the rapid reaction of the carbon with the slurry chemistry.
- Slurry according to embodiments of the invention generally have higher polishing rates for amorphous SiC comprising materials that can have varying contents of carbon and or silicon. One example of a material of this type is BD1 which is a low dielectric constant material manufactured by Applied Materials (Santa Clara, Calif.). This material has a trade name of Black Diamond This material has varying amounts of Si—C—O and can also be doped with nitrogen. The removal rate at PH 3.0 using 1% coated 75 nm silica particles at 2 psi was found to be 1374 A/min, as compared 168 A/min for uncoated silica particles.
- The formation of soft functionalized particles can be obtained by breaking down chemicals in the presence of core (e.g. abrasive) particles. If the breakdown is very slow, the coating on the core particles may be very thin that may not be easily discernable by visual means. The functionalization of cores can be determined by observing the flow, agglomeration, or redispersion or gelling behavior of the particles. In this example abrasive diamond, silica and alumina particles were immersed in 0.3M KmO4 solution for extended period exceeding 10 minutes. The slurries were stirred and were exposed to standard artificial lighting conditions. The particle concentration was varied from 0.1 percent to 20 percent. The pH for monitoring was typically in the acid environments (pH 2 to pH 7). The particle characteristics we observed and compared with similar concentration particles that we not dipped in permanganate solution. To compensate for the permanganate a similar amount of salt KCl was added to the particle solution. The following observation were made. The silica based colloidal solution in absence of permanganate solution typically gelled (formed a glob) in acidic pH conditions. The gelling rate varied from several minutes to days depending on the concentration of particles and the salt concentration. Such gelling made the slurry unusable for CMP applications. In contrast the KMnO4 treated silica particles in acidic environments did not gel under any concentration conditions, thus suggesting functionalization of the particles with modification of the surface characteristics. The gelling behavior of the functionalized particles was found to be similar to the Mn(III)/Mn(IV) coated particles suggesting a very thin functionalization layer can significantly alter the gelling characteristics. The alumina and diamond functionalized particles also showed unique flow characterstics. The redispersion of the particles was much easier compared to non-functionalized particles.
- While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. Numerous changes to the disclosed embodiments can be made in accordance with the disclosure herein without departing from the spirit or scope of the invention. Thus, the breadth and scope of the present invention should not be limited by any of the above described embodiments. Rather, the scope of the invention should be defined in accordance with the following claims and their equivalents.
- Although the invention has been illustrated and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of this specification and the annexed drawings. In addition, while a particular feature of the invention may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for any given or particular application.
- The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, to the extent that the terms “including”, “includes”, “having”, “has”, “with”, or variants thereof are used in either the detailed description and/or the claims, such terms are intended to be inclusive in a manner similar to the term “comprising.”
- Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
- The Abstract of the Disclosure is provided to comply with 37 C.F.R. § 1.72(b), requiring an abstract that will allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the following claims.
Claims (29)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/422,771 US9368367B2 (en) | 2009-04-13 | 2009-04-13 | Chemical mechanical polishing of silicon carbide comprising surfaces |
PCT/US2010/030898 WO2010120784A1 (en) | 2009-04-13 | 2010-04-13 | Chemical mechanical polishing of silicon carbide comprising surfaces |
EP10715401.5A EP2419922B1 (en) | 2009-04-13 | 2010-04-13 | Chemical mechanical polishing of silicon carbide comprising surfaces, and slurry composition |
KR1020117027033A KR101307267B1 (en) | 2009-04-13 | 2010-04-13 | Chemical Mechanical Polishing of Silicon Carbide Comprising Surfaces |
US13/305,479 US8557133B2 (en) | 2009-04-13 | 2011-11-28 | Chemical mechanical polishing of silicon carbide comprising surfaces |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/422,771 US9368367B2 (en) | 2009-04-13 | 2009-04-13 | Chemical mechanical polishing of silicon carbide comprising surfaces |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/305,479 Division US8557133B2 (en) | 2009-04-13 | 2011-11-28 | Chemical mechanical polishing of silicon carbide comprising surfaces |
Publications (2)
Publication Number | Publication Date |
---|---|
US20100258528A1 true US20100258528A1 (en) | 2010-10-14 |
US9368367B2 US9368367B2 (en) | 2016-06-14 |
Family
ID=42199549
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/422,771 Active 2030-09-14 US9368367B2 (en) | 2009-04-13 | 2009-04-13 | Chemical mechanical polishing of silicon carbide comprising surfaces |
US13/305,479 Active US8557133B2 (en) | 2009-04-13 | 2011-11-28 | Chemical mechanical polishing of silicon carbide comprising surfaces |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/305,479 Active US8557133B2 (en) | 2009-04-13 | 2011-11-28 | Chemical mechanical polishing of silicon carbide comprising surfaces |
Country Status (4)
Country | Link |
---|---|
US (2) | US9368367B2 (en) |
EP (1) | EP2419922B1 (en) |
KR (1) | KR101307267B1 (en) |
WO (1) | WO2010120784A1 (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110291104A1 (en) * | 2010-05-27 | 2011-12-01 | Cree, Inc. | Smoothing method for semiconductor material and wafers produced by same |
US20120045972A1 (en) * | 2009-04-15 | 2012-02-23 | Rhodia (China) Co., Ltd. | A cerium-based particle composition and the preparation thereof |
WO2012135342A1 (en) * | 2011-03-28 | 2012-10-04 | Sinmat, Inc. | Chemical mechanical polishing of group iii-nitride surfaces |
WO2013054883A1 (en) | 2011-10-13 | 2013-04-18 | 三井金属鉱業株式会社 | Polishing slurry, and polishing method |
EP2662427A2 (en) | 2012-05-10 | 2013-11-13 | Air Products And Chemicals, Inc. | Chemical mechanical polishing composition having chemical additives and methods for using same |
WO2014007836A1 (en) | 2012-07-05 | 2014-01-09 | Ihnfeldt Robin | Contact release capsule useful for chemical mechanical planarization slurry |
US20140057438A1 (en) * | 2011-04-26 | 2014-02-27 | Asahi Glass Company, Limited | Polishing method of non-oxide single-crystal substrate |
US20150084065A1 (en) * | 2012-04-27 | 2015-03-26 | Mitsui Mining & Smelting Co., Ltd. | SiC SINGLE CRYSTAL SUBSTRATE |
US8999193B2 (en) | 2012-05-10 | 2015-04-07 | Air Products And Chemicals, Inc. | Chemical mechanical polishing composition having chemical additives and methods for using same |
US20160222265A1 (en) * | 2013-10-03 | 2016-08-04 | Mitsui Mining & Smelting Co., Ltd. | Abrasive material, method for producing same, and abrasive slurry containing same |
US20160280963A1 (en) * | 2009-06-05 | 2016-09-29 | Basf Se | Raspberry-type metal oxide nanostructures coated with ceo2 nanoparticles for chemical mechanical planarization (cmp) |
WO2016168231A1 (en) * | 2015-04-13 | 2016-10-20 | Cabot Microelectronics Corporation | Diamond-based slurries with improved sapphire removal rate and surface roughness |
US9567492B2 (en) | 2014-08-28 | 2017-02-14 | Sinmat, Inc. | Polishing of hard substrates with soft-core composite particles |
WO2018057674A1 (en) | 2016-09-23 | 2018-03-29 | Saint-Gobain Ceramics & Plastics, Inc. | Chemical mechanical planarization slurry and method for forming same |
US9950404B1 (en) * | 2012-03-29 | 2018-04-24 | Alta Devices, Inc. | High throughput polishing system for workpieces |
IL262188A (en) * | 2016-04-28 | 2018-11-29 | Drylyte Sl | Method for smoothing and polishing metals via ion transport by means of free solid bodies and solid bodies for carrying out said method. |
US20180350937A1 (en) * | 2016-12-30 | 2018-12-06 | United Microelectronics Corp. | Method for fabricating a semiconductor device |
US20190010359A1 (en) * | 2016-02-09 | 2019-01-10 | Mitsui Mining & Smelting Co., Ltd. | Polishing slurry and polishing material |
WO2019014213A1 (en) * | 2017-07-10 | 2019-01-17 | Sinmat, Inc. | Hard abrasive particle-free polishing of hard materials |
CN110072956A (en) * | 2016-12-22 | 2019-07-30 | 三井金属矿业株式会社 | Lapping liquid and grinding method |
WO2020123332A1 (en) * | 2018-12-10 | 2020-06-18 | Cabot Microelectronics Corporation | Oxidizer free slurry for ruthenium cmp |
US11339309B2 (en) | 2016-12-22 | 2022-05-24 | Mitsui Mining & Smelting Co., Ltd. | Polishing liquid and polishing method |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104723208A (en) * | 2013-12-20 | 2015-06-24 | 中芯国际集成电路制造(上海)有限公司 | Chemical mechanical polishing method |
US9944829B2 (en) | 2015-12-03 | 2018-04-17 | Treliant Fang | Halite salts as silicon carbide etchants for enhancing CMP material removal rate for SiC wafer |
US11781039B2 (en) | 2016-12-26 | 2023-10-10 | Fujimi Incorporated | Polishing composition and polishing method |
CN109545680B (en) * | 2018-10-16 | 2020-11-20 | 山东天岳先进材料科技有限公司 | Rapid preparation method of high-flatness and low-damage monocrystalline silicon carbide substrate |
WO2023243905A1 (en) * | 2022-06-17 | 2023-12-21 | 주식회사 케이씨텍 | Polishing slurry composition for silicon carbide wafer |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5835120A (en) * | 1994-10-25 | 1998-11-10 | Oki Electric Industry Co., Ltd. | Double-resolution optical system for electrophotographic printer |
US6299795B1 (en) * | 2000-01-18 | 2001-10-09 | Praxair S.T. Technology, Inc. | Polishing slurry |
US20020004360A1 (en) * | 2000-06-01 | 2002-01-10 | Katsuhiro Ota | Polishing slurry |
US6375545B1 (en) * | 1999-01-18 | 2002-04-23 | Kabushiki Kaisha Toshiba | Chemical mechanical method of polishing wafer surfaces |
US6464740B1 (en) * | 1998-06-11 | 2002-10-15 | Honeywell International Inc. | Reactive aqueous metal oxide sols as polishing slurries for low dielectric constant materials |
US20040060502A1 (en) * | 2002-09-26 | 2004-04-01 | University Of Florida | High selectivity and high planarity dielectric polishing |
US20060261040A1 (en) * | 2001-12-21 | 2006-11-23 | Micron Technology, Inc. | Methods for planarization of group VIII metal-containing surfaces using oxidizing agents |
US20070045233A1 (en) * | 1999-07-13 | 2007-03-01 | Kao Corporation | Polishing liquid composition |
US20070224806A1 (en) * | 2006-03-23 | 2007-09-27 | Fujifilm Corporation | Metal polishing slurry |
US20080057713A1 (en) * | 2006-09-05 | 2008-03-06 | Cabot Microelectronics Corporation | Silicon carbide polishing method utilizing water-soluble oxidizers |
US20080153292A1 (en) * | 2006-09-05 | 2008-06-26 | Cabot Microelectronics Corporation | Silicon carbide polishing method utilizing water-soluble oxidizers |
WO2008102672A1 (en) * | 2007-02-20 | 2008-08-28 | Sumitomo Electric Industries, Ltd. | Polishing slurry, method for manufacturing the polishing slurry, nitride crystalline material and method for polishing surface of the nitride crystalline material |
US20090280329A1 (en) * | 2004-09-01 | 2009-11-12 | Ppg Industries Ohio, Inc. | Polyurethanes, Articles and Coatings Prepared Therefrom and Methods of Making the Same |
US20110123770A1 (en) * | 2004-04-02 | 2011-05-26 | Flint Trading, Inc. | Preformed thermoplastic pavement marking and method utilizing large aggregate for improved long term skid resistance and reduced tire tracking |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6720264B2 (en) | 1999-11-04 | 2004-04-13 | Advanced Micro Devices, Inc. | Prevention of precipitation defects on copper interconnects during CMP by use of solutions containing organic compounds with silica adsorption and copper corrosion inhibiting properties |
JP4028163B2 (en) | 1999-11-16 | 2007-12-26 | 株式会社デンソー | Mechanochemical polishing method and mechanochemical polishing apparatus |
US20020142619A1 (en) * | 2001-03-30 | 2002-10-03 | Memc Electronic Materials, Inc. | Solution composition and process for etching silicon |
JP2004331852A (en) * | 2003-05-09 | 2004-11-25 | Tama Kagaku Kogyo Kk | Abrasive slurry excellent in dispersion stability, and manufacturing method for substrate |
US20060219663A1 (en) * | 2005-03-31 | 2006-10-05 | Applied Materials, Inc. | Metal CMP process on one or more polishing stations using slurries with oxidizers |
JP5336699B2 (en) | 2006-09-15 | 2013-11-06 | 株式会社ノリタケカンパニーリミテド | Polishing method of crystal material |
-
2009
- 2009-04-13 US US12/422,771 patent/US9368367B2/en active Active
-
2010
- 2010-04-13 WO PCT/US2010/030898 patent/WO2010120784A1/en active Application Filing
- 2010-04-13 EP EP10715401.5A patent/EP2419922B1/en active Active
- 2010-04-13 KR KR1020117027033A patent/KR101307267B1/en active IP Right Grant
-
2011
- 2011-11-28 US US13/305,479 patent/US8557133B2/en active Active
Patent Citations (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5835120A (en) * | 1994-10-25 | 1998-11-10 | Oki Electric Industry Co., Ltd. | Double-resolution optical system for electrophotographic printer |
US6464740B1 (en) * | 1998-06-11 | 2002-10-15 | Honeywell International Inc. | Reactive aqueous metal oxide sols as polishing slurries for low dielectric constant materials |
US6375545B1 (en) * | 1999-01-18 | 2002-04-23 | Kabushiki Kaisha Toshiba | Chemical mechanical method of polishing wafer surfaces |
US20070045233A1 (en) * | 1999-07-13 | 2007-03-01 | Kao Corporation | Polishing liquid composition |
US6299795B1 (en) * | 2000-01-18 | 2001-10-09 | Praxair S.T. Technology, Inc. | Polishing slurry |
US20020004360A1 (en) * | 2000-06-01 | 2002-01-10 | Katsuhiro Ota | Polishing slurry |
US20060261040A1 (en) * | 2001-12-21 | 2006-11-23 | Micron Technology, Inc. | Methods for planarization of group VIII metal-containing surfaces using oxidizing agents |
US20040060502A1 (en) * | 2002-09-26 | 2004-04-01 | University Of Florida | High selectivity and high planarity dielectric polishing |
US20110123770A1 (en) * | 2004-04-02 | 2011-05-26 | Flint Trading, Inc. | Preformed thermoplastic pavement marking and method utilizing large aggregate for improved long term skid resistance and reduced tire tracking |
US20090280329A1 (en) * | 2004-09-01 | 2009-11-12 | Ppg Industries Ohio, Inc. | Polyurethanes, Articles and Coatings Prepared Therefrom and Methods of Making the Same |
US20070224806A1 (en) * | 2006-03-23 | 2007-09-27 | Fujifilm Corporation | Metal polishing slurry |
US20080057713A1 (en) * | 2006-09-05 | 2008-03-06 | Cabot Microelectronics Corporation | Silicon carbide polishing method utilizing water-soluble oxidizers |
US20080153292A1 (en) * | 2006-09-05 | 2008-06-26 | Cabot Microelectronics Corporation | Silicon carbide polishing method utilizing water-soluble oxidizers |
WO2008102672A1 (en) * | 2007-02-20 | 2008-08-28 | Sumitomo Electric Industries, Ltd. | Polishing slurry, method for manufacturing the polishing slurry, nitride crystalline material and method for polishing surface of the nitride crystalline material |
US20090317638A1 (en) * | 2007-02-20 | 2009-12-24 | Sumitomo Electric Industries, Ltd. | Polishing slurry, method for manufacturing the polishing slurry, nitride crystalline material and method for plishing surface of the nitride crystalline material |
Cited By (48)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20120045972A1 (en) * | 2009-04-15 | 2012-02-23 | Rhodia (China) Co., Ltd. | A cerium-based particle composition and the preparation thereof |
US8727833B2 (en) * | 2009-04-15 | 2014-05-20 | Rhodia (China) Co., Ltd. | Cerium-based particle composition and the preparation thereof |
US20160280963A1 (en) * | 2009-06-05 | 2016-09-29 | Basf Se | Raspberry-type metal oxide nanostructures coated with ceo2 nanoparticles for chemical mechanical planarization (cmp) |
US20110291104A1 (en) * | 2010-05-27 | 2011-12-01 | Cree, Inc. | Smoothing method for semiconductor material and wafers produced by same |
US8445386B2 (en) * | 2010-05-27 | 2013-05-21 | Cree, Inc. | Smoothing method for semiconductor material and wafers produced by same |
US9070654B2 (en) | 2010-05-27 | 2015-06-30 | Cree, Inc. | Smoothing method for semiconductor material and wafers produced by same |
JP2014522098A (en) * | 2011-03-28 | 2014-08-28 | シンマット,インコーポレーテッド | Chemical mechanical polishing method for III-nitride surface |
WO2012135342A1 (en) * | 2011-03-28 | 2012-10-04 | Sinmat, Inc. | Chemical mechanical polishing of group iii-nitride surfaces |
US8828874B2 (en) | 2011-03-28 | 2014-09-09 | Sinmat, Inc. | Chemical mechanical polishing of group III-nitride surfaces |
US20140057438A1 (en) * | 2011-04-26 | 2014-02-27 | Asahi Glass Company, Limited | Polishing method of non-oxide single-crystal substrate |
US9129901B2 (en) * | 2011-04-26 | 2015-09-08 | Asahi Glass Company, Limited | Polishing method of non-oxide single-crystal substrate |
US8980122B2 (en) | 2011-07-08 | 2015-03-17 | General Engineering & Research, L.L.C. | Contact release capsule useful for chemical mechanical planarization slurry |
US9334422B2 (en) | 2011-07-08 | 2016-05-10 | General Engineering & Research, L.L.C. | Contact release capsule useful for chemical mechanical planarization slurry |
EP2767568A4 (en) * | 2011-10-13 | 2015-10-07 | Mitsui Mining & Smelting Co | Polishing slurry, and polishing method |
US9318339B2 (en) | 2011-10-13 | 2016-04-19 | Mitsui Mining & Smelting, Ltd | Polishing slurry and polishing method |
WO2013054883A1 (en) | 2011-10-13 | 2013-04-18 | 三井金属鉱業株式会社 | Polishing slurry, and polishing method |
US11267095B2 (en) * | 2012-03-29 | 2022-03-08 | Utica Leaseco, Llc | High throughput polishing system for workpieces |
US9950404B1 (en) * | 2012-03-29 | 2018-04-24 | Alta Devices, Inc. | High throughput polishing system for workpieces |
US20180229342A1 (en) * | 2012-03-29 | 2018-08-16 | Alta Devices, Inc. | High throughput polishing system for workpieces |
US20150084065A1 (en) * | 2012-04-27 | 2015-03-26 | Mitsui Mining & Smelting Co., Ltd. | SiC SINGLE CRYSTAL SUBSTRATE |
EP2843089A4 (en) * | 2012-04-27 | 2015-10-14 | Mitsui Mining & Smelting Co | SiC SINGLE CRYSTAL SUBSTRATE |
US9391148B2 (en) * | 2012-04-27 | 2016-07-12 | Mitsui Mining & Smelting Co., Ltd. | SiC single crystal substrate |
EP2662427A2 (en) | 2012-05-10 | 2013-11-13 | Air Products And Chemicals, Inc. | Chemical mechanical polishing composition having chemical additives and methods for using same |
EP3333232A2 (en) | 2012-05-10 | 2018-06-13 | Versum Materials US, LLC | Chemical mechanical polishing composition having chemical additives and methods for using |
US8999193B2 (en) | 2012-05-10 | 2015-04-07 | Air Products And Chemicals, Inc. | Chemical mechanical polishing composition having chemical additives and methods for using same |
WO2014007836A1 (en) | 2012-07-05 | 2014-01-09 | Ihnfeldt Robin | Contact release capsule useful for chemical mechanical planarization slurry |
US20160222265A1 (en) * | 2013-10-03 | 2016-08-04 | Mitsui Mining & Smelting Co., Ltd. | Abrasive material, method for producing same, and abrasive slurry containing same |
US9873824B2 (en) * | 2013-10-03 | 2018-01-23 | Mitsui Mining & Smelting Co., Ltd. | Abrasive material, method for producing same, and abrasive slurry containing same |
US9567492B2 (en) | 2014-08-28 | 2017-02-14 | Sinmat, Inc. | Polishing of hard substrates with soft-core composite particles |
WO2016168231A1 (en) * | 2015-04-13 | 2016-10-20 | Cabot Microelectronics Corporation | Diamond-based slurries with improved sapphire removal rate and surface roughness |
US20190010359A1 (en) * | 2016-02-09 | 2019-01-10 | Mitsui Mining & Smelting Co., Ltd. | Polishing slurry and polishing material |
US11015086B2 (en) * | 2016-02-09 | 2021-05-25 | Mitsui Mining & Smelting Co., Ltd. | Polishing slurry and polishing material |
IL262188A (en) * | 2016-04-28 | 2018-11-29 | Drylyte Sl | Method for smoothing and polishing metals via ion transport by means of free solid bodies and solid bodies for carrying out said method. |
EP3372711B1 (en) * | 2016-04-28 | 2021-12-01 | Drylyte, S.L. | Method for smoothing and polishing metals via ion transport by means of free solid bodies |
CN113388881A (en) * | 2016-04-28 | 2021-09-14 | 德里莱特公司 | Solid for smoothing and polishing metals by ion transport |
CN109415839A (en) * | 2016-04-28 | 2019-03-01 | 德里莱特公司 | Smooth and polishing metal method is transmitted by the ion of free solid and executes the solid of this method |
EP3940121A3 (en) * | 2016-04-28 | 2022-03-23 | Drylyte, S.L. | Solid bodies for carrying out smoothing and polishing metals via ion transport |
EP3516002A4 (en) * | 2016-09-23 | 2020-05-27 | Saint-Gobain Ceramics&Plastics, Inc. | Chemical mechanical planarization slurry and method for forming same |
WO2018057674A1 (en) | 2016-09-23 | 2018-03-29 | Saint-Gobain Ceramics & Plastics, Inc. | Chemical mechanical planarization slurry and method for forming same |
US11339309B2 (en) | 2016-12-22 | 2022-05-24 | Mitsui Mining & Smelting Co., Ltd. | Polishing liquid and polishing method |
CN110072956A (en) * | 2016-12-22 | 2019-07-30 | 三井金属矿业株式会社 | Lapping liquid and grinding method |
EP3561857B1 (en) * | 2016-12-22 | 2021-06-09 | Mitsui Mining & Smelting Co., Ltd. | Polishing liquid and polishing method |
US10510884B2 (en) * | 2016-12-30 | 2019-12-17 | United Microelectronics Corp. | Method for fabricating a semiconductor device |
US20180350937A1 (en) * | 2016-12-30 | 2018-12-06 | United Microelectronics Corp. | Method for fabricating a semiconductor device |
WO2019014213A1 (en) * | 2017-07-10 | 2019-01-17 | Sinmat, Inc. | Hard abrasive particle-free polishing of hard materials |
CN111094482A (en) * | 2017-07-10 | 2020-05-01 | 辛麦特有限公司 | Hard-particle-free polishing of hard materials |
US11820918B2 (en) | 2017-07-10 | 2023-11-21 | Entegris, Inc. | Hard abrasive particle-free polishing of hard materials |
WO2020123332A1 (en) * | 2018-12-10 | 2020-06-18 | Cabot Microelectronics Corporation | Oxidizer free slurry for ruthenium cmp |
Also Published As
Publication number | Publication date |
---|---|
EP2419922A1 (en) | 2012-02-22 |
US9368367B2 (en) | 2016-06-14 |
KR101307267B1 (en) | 2013-09-26 |
EP2419922B1 (en) | 2017-07-19 |
WO2010120784A8 (en) | 2011-01-06 |
WO2010120784A1 (en) | 2010-10-21 |
KR20120037372A (en) | 2012-04-19 |
US8557133B2 (en) | 2013-10-15 |
US20120070991A1 (en) | 2012-03-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8557133B2 (en) | Chemical mechanical polishing of silicon carbide comprising surfaces | |
US8828874B2 (en) | Chemical mechanical polishing of group III-nitride surfaces | |
US7998866B2 (en) | Silicon carbide polishing method utilizing water-soluble oxidizers | |
JP6367815B2 (en) | Smooth diamond surface and CMP method for its formation | |
TWI760589B (en) | Tungsten buff polishing compositions with improved topography | |
AU2008308580B2 (en) | Improved silicon carbide particles, methods of fabrication, and methods using same | |
AU2008308583B2 (en) | Polishing of sapphire with composite slurries | |
EP3186825B1 (en) | Polishing of hard substrates with soft-core composite particles | |
US20060118760A1 (en) | Slurry composition and methods for chemical mechanical polishing | |
WO2000073396A9 (en) | Slurry composition and method of chemical mechanical polishing using same | |
WO2009017734A1 (en) | Slurry containing multi-oxidizer and nano-sized diamond abrasive for tungsten cmp | |
TW201311842A (en) | A process for the manufacture of semiconductor devices comprising the chemical mechanical polishing of elemental germanium and/or Si1-xGex material in the presence of a CMP composition having a pH value of 3.0 to 5.5 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SINMAT, INC., FLORIDA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHAKKARAVARTHI ARJUNAN, ARUL;DAS, DIBAKAR;SINGH, DEEPIKA;AND OTHERS;REEL/FRAME:022539/0434 Effective date: 20090413 |
|
AS | Assignment |
Owner name: UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC., F Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SINGH, RAJIV K.;REEL/FRAME:024904/0385 Effective date: 20100825 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY Year of fee payment: 4 |
|
AS | Assignment |
Owner name: ENTEGRIS, INC., MASSACHUSETTS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SINMAT, INC.;REEL/FRAME:052388/0520 Effective date: 20200110 |
|
FEPP | Fee payment procedure |
Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
AS | Assignment |
Owner name: TRUIST BANK, AS NOTES COLLATERAL AGENT, NORTH CAROLINA Free format text: SECURITY INTEREST;ASSIGNORS:ENTEGRIS, INC.;ENTEGRIS GP, INC.;POCO GRAPHITE, INC.;AND OTHERS;REEL/FRAME:060613/0072 Effective date: 20220706 Owner name: MORGAN STANLEY SENIOR FUNDING, INC., AS COLLATERAL AGENT, MARYLAND Free format text: SECURITY INTEREST;ASSIGNORS:ENTEGRIS, INC.;ENTEGRIS GP, INC.;POCO GRAPHITE, INC.;REEL/FRAME:060614/0980 Effective date: 20220706 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 8 |